When is the next Steam sale?

in summer, closer to June

In mid-June.

from June 23rd to July 4th.

There are already 24 hours before the start of the grand sale! =)

Agent Qracle
Tell me exactly what time

Monitor in the evening after 21:00

Agent Qracle
20:00

The Steam Summer Sale begins on June 23rd at 7:45 pm ET and ends on July 4, 2016 at 8:00 pm ET.